¿Why can't I use this name as gamertag?

What could be happening is the name you're trying to use is tripping the gamertag filter, which can be a tad bit extreme with what it considers okay and not okay. Certain phrases to names (Suki for example) are not allowed either, so the only way to get around this if every option you've tried to use doesn't work is try a different name entirely.

Display names on the forums can be different from gamertags. Underscores can't be used in gamertags so that is not their gamertag.

Just don't know why we can't put gamertag names on this site regarding a hacker problem or any other rleated stuff.We have a right to post gamertag if he or she has a problem.

should also be noted just because you can't find it doesn't mean it isn't in use

Gamer tag is the same as gamertag or Gamertag

But to find a name you have to be very very specific and have the exact spelling that's why you aren't seeing it and saying it's is in use

There is millions of possibilities in varitians

You are just going to have to be more creative it's that simple

Why is my name Prettybunny225 and not the name that I changed it to. My gamertag should be (TTVH3ntAiGod it's not really inappropriate it's just a name if you let me do another change gamertag for free(I used all of mine) I will change it)

Hello Sir! , I am sorry to hear about the Gamertag change. Unfortunately the name inappropriate. We do not offer Free gamertags! Please refer to Xbox Guidelines, and then try a new Gamertag! Enjoy your day!